Electrical measuring instrument



March 20, 1928. 1,662,835

A. R. RUTTER ELECTRI CAL MEASURI NG I NSTRUMENT Filed March 12. 1926 INVENTOR ToNEY Patented Mar. 20, 1928.

UNITED STATES A y 1,662,835 PATENT OFFICE.

ABGYLE B. BUTTER, OF EAST PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

' ELECTRICAL MEASURING INSTRUMENT.

My invention relates to electrical measuring instruments and particularly to the magnetizabie core member of. watt-meters and other similar motor meters.

.5 One object of my invention is to rovide a measur ng instrument, of the above-indicated character, that shall be exceedingly simple, compact, and light inconstruction and easy to manufacture.

Another object of my invention is to provide a measuring instrument, of the above indicated character, that shall have its magnetizable core member provided with interfitting portions to facilitate assembly 'In my invention a dove-tailed perlmetral segment is provided for the magnetizable core member, which is pressed into operative position with respect to the core member after the series or current coil of the motorae meter is wound or placed in position.

In the prior art, magnetizable core members of substantially thesame shape have been provided with no removable portions rendering the winding of coilsthereon very difiicult.

In a motor-meter embodying my invention a laminated base portion is punched out separately from the remainder of the laminated magnetizable .core member to expose the polar-projections-in such position that they may be easily wound with the necessary coils. The base portion is subsequently pressed into position.

The single figure of the accompanying drawing is a front elevational view of the motor-meter embodying my invention.

A motor-meter of the above mentioned character comprises, in general, a laminated magnetizable core member 1, having a removable base portion 2, and a series orcurrent winding 3.

The ma'gnetizable core member 1 is constructed of a plurality of continuous lam inations, having, a central portion 5 and side 5 portions 6 and 7 that are integral with the outer portion 4 at oneend and spaced apart from each other at their free ends by airgaps 8 and 9. A slot 10 is provided near the free end of the central portion 5. and the so side-portions 6 and 7 are provided with laterally extending horns 11 and 12, respec-.

, tively. The series or current winding 3 is disposed 'around the spaced-apart ends of the members 5, 6, and 7.

The base portion 2 which comprises the lower portion of the core member 1 is punched out separately from a plurality of continuous laminations. Both ends of the base portion 2 are provided with dovetails 13 and 14 to fit into suitable recesses punched in the lower extremities of outer portion 4. After the series or current coil3 is wound on the polar projections 5, 6, and 7, the base portion 2 is pressed into place by forcing the dovetails l3 and 14 into the receptive recesses on the lower extremities of outer portion t.

By punching the core member 1 in two portions means are provided to greatly facilitate the winding of the series or current coil 3. When the two portions are joined together the resulting complete core members- 1 has all the advantages of acne-piece core member.

I claim as my invention:

1. A lamination comprising a pluralit of magnetizable members, one of said mem ers comprising ole portion structure, another of said mem ers comprising a section forming with said pole portion structure a fiux gap for the reception of a movable meter disc, said members being secured together in interlocking relation and being non-detachable in a direction extending at right angles to the plane of said meter disc.

2. A lamination comprising a plurality of magnetizable members, one of said members comprising pole portion structure, another of said members comprising a section forming with said pole portion structure. a flux gap for the reception of a movable meter disc, said members being secured together in dovetail relation and being non-detachable in a direction extending at right angles to the plane of said meter disc:

3. A lamination comprising a pluralit of magnetizable members, one of-sald mem ers comprising a plurality of spaced pole por' tions, another of said members comprising a section forming with said pole portions a. flux gap for the reception of a movable meter disc, said members being secured together in interlocking relation and being non-detachable in a direction extending at right angles to the plane of said meter disc.

4. A lamination comprising a plurality of magnetizable members, one ofsaid members comprising a plurality of spaced pole portions, another of said members comprising a section forming with said pole portions aflux gap for the reception of a movable meter .disc, said members being secured together in interlocking relation and being detachable only bymoving them relatively in a direction extending substantially parallel with the plane of said meter disc.

5. A magnetizable structurecomprising a plurality of groups of stacked laminations, one of said groups comprising a plurality of spaced pole portions, another of said groups comprisinga section forming with said pole portions a flux gap for the reception of a movable meter disc, said groups being secured together in interlocking relation and being non-detachable in a direction ARGYLE R. BUTTER. 

